\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx,ninecolors}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usetikzlibrary{patterns, calc}
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\begin{document}
\small
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  \fill[left color=gray,right color=gray,middle color=white](-0.2,-3.5)rectangle(0.2,1.0)node[text=black,right]{轴};
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  \draw[thin,](0.9,-0.9)--(1.3,0.5)node[right]{\parbox{6em}{\centering 固定在量热器内壁上的叶片}}--(0.9,-2.4);
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\end{document}